compver

Description

compver is an ASCII file used to specify previous versions of the
associated package which are upward compatible. It is created by a package
developer.

Each line of the file specifies a previous version of the associated
package with which the current version is backward compatible.

Since some packages may require installation of a specific version of another
software package, compatibility information is extremely crucial. Consider, for example, a package
called "A" which requires version "1.0" of application "B" as a prerequisite
for installation. If the customer installing "A" has a newer version of "B"
(version 1.3), the compver file for "B" must indicate that "1.3" is
compatible with version "1.0" in order for the customer to install package
"A".